All Outputs (34)

A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars (2015)
Journal Article
Maxted, P., Serenelli, A., & Southworth, J. (2015). A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars. Astronomy & Astrophysics, 577, Article A90. https://doi.org/10.1051/0004-6361/201525774

Previous studies suggest that tidal interactions may be responsible for discrepancies between the ages of exoplanet host stars estimated using stellar models (isochronal ages) and age estimates based on the stars' rotation periods (gyrochronological... Read More about A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars.

Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry (2015)
Journal Article
Ciceri, S., Mancini, L., Southworth, J., Bruni, I., Nikolov, N., D’Ago, G., …Th. Henning. (2015). Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry. Astronomy & Astrophysics, 577, Article A54. https://doi.org/10.1051/0004-6361/201425449

Context. Accurate and repeated photometric follow-up observations of planetary transit events are important to precisely characterize the physical properties of exoplanets. A good knowledge of the main characteristics of the exoplanets is fundamental... Read More about Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry.

Transits and starspots in the WASP-6 planetary system (2015)
Journal Article
Tregloan-Reed, J., Southworth, J., Burgdorf, M., Calchi Novati, S., Dominik, M., Finet, F., …Surdej, J. (2015). Transits and starspots in the WASP-6 planetary system. Monthly Notices of the Royal Astronomical Society, 450(2), 1760 -1769. https://doi.org/10.1093/mnras/stv730

We present updates to PRISM, a photometric transit-starspot model, and GEMC, a hybrid optimization code combining MCMC and a genetic algorithm. We then present high-precision photometry of four transits in the WASP-6 planetary system, two of which co... Read More about Transits and starspots in the WASP-6 planetary system.

OGLE-2011-BLG-0265Lb: A JOVIAN MICROLENSING PLANET ORBITING AN M DWARF (2015)
Journal Article
Skowron, J., Shin, I., Udalski, A., Han, C., Sumi, T., Shvartzvald, Y., …Wertz, O. (2015). OGLE-2011-BLG-0265Lb: A JOVIAN MICROLENSING PLANET ORBITING AN M DWARF. Astrophysical Journal, 804(1), Article 33. https://doi.org/10.1088/0004-637X/804/1/33

We report the discovery of a Jupiter-mass planet orbiting an M-dwarf star that gave rise to the microlensing event OGLE-2011-BLG-0265. Such a system is very rare among known planetary systems and thus the discovery is important for theoretical studie... Read More about OGLE-2011-BLG-0265Lb: A JOVIAN MICROLENSING PLANET ORBITING AN M DWARF.

PATHWAY TO THE GALACTIC DISTRIBUTION OF PLANETS: COMBINED SPITZER AND GROUND-BASED MICROLENS PARALLAX MEASUREMENTS OF 21 SINGLE-LENS EVENTS (2015)
Journal Article
Calchi Novati, S., Gould, A., Udalski, A., Menzies, J., Bond, I., Shvartzvald, Y., …DePoy, D. (2015). PATHWAY TO THE GALACTIC DISTRIBUTION OF PLANETS: COMBINED SPITZER AND GROUND-BASED MICROLENS PARALLAX MEASUREMENTS OF 21 SINGLE-LENS EVENTS. Astrophysical Journal, 804(1), Article 20. https://doi.org/10.1088/0004-637X/804/1/20

We present microlens parallax measurements for 21 (apparently) isolated lenses observed toward the Galactic bulge that were imaged simultaneously from Earth and Spitzer, which was ~1 AU west of Earth in projection. We combine these measurements with... Read More about PATHWAY TO THE GALACTIC DISTRIBUTION OF PLANETS: COMBINED SPITZER AND GROUND-BASED MICROLENS PARALLAX MEASUREMENTS OF 21 SINGLE-LENS EVENTS.

SPECTROSCOPIC ORBITAL PERIODS FOR 29 CATACLYSMIC VARIABLES FROM THE SLOAN DIGITAL SKY SURVEY (2015)
Journal Article
Thorstensen, J. R., Taylor, C. J., Peters, C. S., Skinner, J. N., Southworth, J., & Gänsicke, B. T. (2015). SPECTROSCOPIC ORBITAL PERIODS FOR 29 CATACLYSMIC VARIABLES FROM THE SLOAN DIGITAL SKY SURVEY. Astronomical Journal, 149(4), 128. https://doi.org/10.1088/0004-6256/149/4/128

We report follow-up spectroscopy of 29 cataclysmic variables from the Sloan Digital Sky Survey (SDSS), 22 of which were discovered by SDSS and seven of which are previously known systems that were recovered in SDSS. The periods for 16 of these object... Read More about SPECTROSCOPIC ORBITAL PERIODS FOR 29 CATACLYSMIC VARIABLES FROM THE SLOAN DIGITAL SKY SURVEY.

The GAPS programme with HARPS-N at TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems (2015)
Journal Article
Damasso, M., Biazzo, K., Bonomo, A., Desidera, S., Lanza, A., Nascimbeni, V., …Southworth, J. (2015). The GAPS programme with HARPS-N at TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems. Astronomy & Astrophysics, 575, Article A111. https://doi.org/10.1051/0004-6361/201425332

Aims. XO-2 is the first confirmed wide stellar binary system where the almost twin components XO-2N and XO-2S have planets, and it is a peculiar laboratory in which to investigate the diversity of planetary systems. This stimulated a detailed charact... Read More about The GAPS programme with HARPS-N at TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems.

The GAPS programme with HARPS-N at TNG VI. The curious case of TrES-4b (2015)
Journal Article
Sozzetti, A., Bonomo, A., Biazzo, K., Mancini, L., Damasso, M., Desidera, S., …Southworth, J. (2015). The GAPS programme with HARPS-N at TNG VI. The curious case of TrES-4b. Astronomy & Astrophysics, 575, Article L15. https://doi.org/10.1051/0004-6361/201425570

We update the TrES-4 system parameters using high-precision HARPS-N radial-velocity measurements and new photometric light curves. A combined spectroscopic and photometric analysis allows us to determine a spectroscopic orbit with a semi-amplitude K... Read More about The GAPS programme with HARPS-N at TNG VI. The curious case of TrES-4b.

High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b (2015)
Journal Article
Mislis, D., Mancini, L., Tregloan-Reed, J., Ciceri, S., Taylor, J., D'Ago, G., …Schroeder, T. (2015). High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b. Monthly Notices of the Royal Astronomical Society, 448(3), 2617 -2623. https://doi.org/10.1093/mnras/stv197

We present an analysis of the Qatar-1 and TrES-5 transiting exoplanetary systems, which contain Jupiter-like planets on short-period orbits around K-dwarf stars. Our data comprise a total of 20 transit light curves obtained using five medium-class te... Read More about High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b.

Bayesian mass and age estimates for transiting exoplanet host stars (2015)
Journal Article
Maxted, P., Serenelli, A., & Southworth, J. (2015). Bayesian mass and age estimates for transiting exoplanet host stars. Astronomy & Astrophysics, 575, Article A36. https://doi.org/10.1051/0004-6361/201425331

The mean density of a star transited by a planet, brown dwarf or low mass star can be accurately measured from its light curve. This measurement can be combined with other observations to estimate its mass and age by comparison with stellar models. O... Read More about Bayesian mass and age estimates for transiting exoplanet host stars.

The two-colour EMCCD instrument for the Danish 1.54 m telescope and SONG (2015)
Journal Article
Skottfelt, J., Bramich, D., Hundertmark, M., Jørgensen, U., Michaelsen, N., Kjærgaard, P., …Pallé, P. (2015). The two-colour EMCCD instrument for the Danish 1.54 m telescope and SONG. Astronomy & Astrophysics, 574, Article A54. https://doi.org/10.1051/0004-6361/201425260

We report on the implemented design of a two-colour instrument based on electron-multiplying CCD (EMCCD) detectors. This instrument is currently installed at the Danish 1.54 m telescope at ESO’s La Silla Observatory in Chile, and will be available at... Read More about The two-colour EMCCD instrument for the Danish 1.54 m telescope and SONG.

Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations (2015)
Journal Article
Skottfelt, J., Bramich, D., Figuera Jaimes, R., Jørgensen, U., Kains, N., Arellano Ferro, A., …MiNDSTEp Consortium, T. (2015). Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations. Astronomy and Astrophysics Supplement Series, 573, Article A103. https://doi.org/10.1051/0004-6361/201424967

Abstract Aims. In this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal-rich ([Fe/H] > -1) globular clusters: NGC 6388, NGC 6441, NGC 6528, NGC 6638, and NGC 6652. The data have been used to perform a cen... Read More about Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations.

Absolute Properties Of The Eclipsing Binary Star Im Persei (2015)
Journal Article
Sandberg Lacy, C. H., Torres, G., Fekel, F. C., Muterspaugh, M. W., & Southworth, J. (2015). Absolute Properties Of The Eclipsing Binary Star Im Persei. Astronomical Journal, 149(1), Article 34. https://doi.org/10.1088/0004-6256/149/1/34

IM Per is a detached A7 eccentric eclipsing binary star. We have obtained extensive measurements of the light curve (28,225 differential magnitude observations) and radial velocity curve (81 spectroscopic observations) which allow us to fit orbits an... Read More about Absolute Properties Of The Eclipsing Binary Star Im Persei.

DEBCat: A Catalog of Detached Eclipsing Binary Stars (2015)
Conference Proceeding
Southworth, J. (2015). DEBCat: A Catalog of Detached Eclipsing Binary Stars. In Astronomical Society of the Pacific Conference Series

Detached eclipsing binary star systems are our primary source of measured physical properties of normal stars. I introduce DEBCat: a catalogue of detached eclipsing binaries with mass and radius measurements to the 2% precision necessary to put usefu... Read More about DEBCat: A Catalog of Detached Eclipsing Binary Stars.